The TP-7 is a supersensitive microphone for telephone conferencing. Just plug it into the MIC jack of your recorder, and put the earphone side into your ear. When speaking on the telephone, the TP-7 will capture both sides of the conversation for recording on your voice recorder. Frequency is 50 - 20,000 Hz.
It plugs into a 3.5 mm monaural jack and comes with 2 plug adapters to convert either to 3.5 mm stereo plug or to a 2.5 mm monaural plug.
The TP-7 is recommended for use with cell phones and conventional land-line phones.
Note: the TP-7 only acts as a microphone. It will not playback sound. When used with the DM-10 or DM-20, select Monaural Input in the Menu for selection EXT. INPUT.